Getting separated from your friends at a bar or music festival isn't just inconvenient, it can be downright dangerous — wandering around solo and under the influence can set you up to be targeted by creeps with date-rape drugs, get lost or something perhaps a lot worse.

How does it work? Sensors on the bracelet, which sync with your an app on your smartphone via Bluetooth, measure both your alcohol levels and dehydration. Once the bracelet registers alcohol in your system, it vibrates to "check in" with you. If you're OK, you respond by squeezing the bracelet; if you don't squeeze, your friends will be notified so they can come check in on your IRL—the bracelet's even has GPS to help them track you down. Here's hoping some Silicon Valley investment company funds this bracelet, STAT: this could be the best buddy gift for your crew since friendship bracelets.